An iterative scheme based on the phi^4 kink equation generates exact multi-kink and bump solutions with one new modulus per step, and its fixed points are phi^6 kinks.
Weigel, Collective coordinate methods and their applicability to φ4 models, in: A Dynamical Perspective on the φ4 Model (Nonlinear Systems and Complexity, vol
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Iterated ${\phi}^4$ Kinks
An iterative scheme based on the phi^4 kink equation generates exact multi-kink and bump solutions with one new modulus per step, and its fixed points are phi^6 kinks.